package com.ssm.pre.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;

import com.ssm.pre.bean.AccessToken;
import com.ssm.pre.bean.Menu;
import com.ssm.pre.manager.MyX509TrustManager;
import com.ssm.util.Constants;

import net.sf.json.JSONObject;

/**
 * 公众平台通用接口工具类
 * 
 */
public class WeixinUtil {

	// 获取access_token的接口地址（GET） 限200（次/天）
//	public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?" + "grant_type=client_credential&appid=APPID&secret=APPSECRET";
	// 菜单创建（POST） 限100（次/天）
//	public static String menu_create_url = "https://api.weixin.qq.com/cgi-bin/menu/create?" + "access_token=ACCESS_TOKEN";

	/**
	 * 发起https请求并获取结果
	 * 
	 * @param requestUrl  请求地址
	 * @param requestMethod  请求方式（GET、POST）
	 * @param outputStr  提交的数据
	 * @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
	 */
	public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) throws Exception {
		JSONObject jsonObject = null;
		StringBuffer buffer = new StringBuffer();
		// 创建SSLContext对象，并使用我们指定的信任管理器初始化
		TrustManager[] tm = { new MyX509TrustManager() };
		SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
		sslContext.init(null, tm, new java.security.SecureRandom());
		// 从上述SSLContext对象中得到SSLSocketFactory对象
		SSLSocketFactory ssf = sslContext.getSocketFactory();

		URL url = new URL(requestUrl);
		HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
		httpUrlConn.setSSLSocketFactory(ssf);
		httpUrlConn.setDoOutput(true);
		httpUrlConn.setDoInput(true);
		httpUrlConn.setUseCaches(false);
		// 设置请求方式（GET/POST）
		httpUrlConn.setRequestMethod(requestMethod);

		if ("GET".equalsIgnoreCase(requestMethod))
			httpUrlConn.connect();

		// 当有数据需要提交时
		if (null != outputStr) {
			OutputStream outputStream = httpUrlConn.getOutputStream();
			// 注意编码格式，防止中文乱码
			outputStream.write(outputStr.getBytes("UTF-8"));
			outputStream.close();
		}

		// 将返回的输入流转换成字符串
		InputStream inputStream = httpUrlConn.getInputStream();
		InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
		BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

		String str = null;
		while ((str = bufferedReader.readLine()) != null) {
			buffer.append(str);
		}
		bufferedReader.close();
		inputStreamReader.close();
		// 释放资源
		inputStream.close();
		inputStream = null;
		httpUrlConn.disconnect();
		jsonObject = JSONObject.fromObject(buffer.toString());
		return jsonObject;
	}

	/**
	 * 获取access_token
	 * 
	 * @param appid 凭证
	 * @param appsecret 密钥
	 * @return
	 * @throws Exception 
	 */
	public static AccessToken getAccessToken(String appid, String appsecret) throws Exception {
		AccessToken accessToken = null;
		String requestUrl = Constants.ACCESS_TOKEN.replace("APP_ID", appid).replace("APPSECRET", appsecret);
		JSONObject jsonObject = httpRequest(requestUrl, "GET", null);
		System.out.println("---jsonObject="+jsonObject);
		// 如果请求成功
		if (null != jsonObject) {
			accessToken = new AccessToken();
			accessToken.setToken(jsonObject.getString("access_token"));
			accessToken.setExpiresIn(jsonObject.getInt("expires_in"));
		}
		System.out.println(accessToken+"---");
		return accessToken;
	}

	/**
	 * 创建菜单
	 * 
	 * @param menu 菜单实例
	 * @param accessToken 有效的access_token
	 * @return 0表示成功，其他值表示失败
	 * @throws Exception 
	 */
	public static Map<String,Object> createMenu(Menu menu, String accessToken) throws Exception {
		Map<String,Object> returnBack = new HashMap<>();
		// 拼装创建菜单的url
		String url = Constants.MENU_CREATE.replace("ACCESS_TOKEN", accessToken);
		// 将菜单对象转换成json字符串
		String jsonMenu = JSONObject.fromObject(menu).toString();
		System.out.println(jsonMenu);
		// 调用接口创建菜单
		JSONObject jsonObject = httpRequest(url, "POST", jsonMenu);
		if (null != jsonObject) {
			returnBack.put("returnCode", jsonObject.getInt("errcode"));
			returnBack.put("returnMsg", jsonObject.getString("errmsg"));
			return returnBack;
		}else{
			return null;
		}
	}
	
	/**
     * 连接请求微信后台接口
     * @param action 接口url
     * @param json  请求接口传送的json字符串
     **/
    public static int connectWeiXinInterface(String action,String json){
       URL url;
       try {
           url = new URL(action);
           HttpURLConnection http = (HttpURLConnection) url.openConnection();
           http.setRequestMethod("POST");
           http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
           http.setDoOutput(true);
           http.setDoInput(true);
           System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
           System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
           http.connect();
           OutputStream os = http.getOutputStream();
           os.write(json.getBytes("UTF-8"));// 传入参数
           InputStream is = http.getInputStream();
           int size = is.available();
           byte[] jsonBytes = new byte[size];
           is.read(jsonBytes);
           String result = new String(jsonBytes, "UTF-8");
           JSONObject object = JSONObject.fromObject(result);
           if(object.get("errcode").toString().equals("0")){
        	   return 1;
           }
           os.flush();
           os.close();
       } catch (Exception e) {
           e.printStackTrace();
       }
       return 0;
    }
    
    /**
     * URL编码（utf-8）
     * 
     * @param source
     * @return
     */
    public static String urlEncodeUTF8(String source) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }
}
